Lift-to-weight ratio dependence of lift and stability in an active-Maglev system

Makoto Tsuda, Masahiro Tamura, Hiroshi Yamada, Naoyuki Harada, Takataro Hamajima

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1 Citation (Scopus)


In an active-maglev system composed of YBCO bulk and electromagnet, lift-to-weight ratio dependence of lift and stability was investigated experimentally and theoretically. A bulk was levitated by an electromagnet after a field-cooling process for magnetization. It has been shown that lift and stability of the bulk are closely related to both the magnitude of trapped magnetic field and the magnetic field distribution generated by the electromagnet. Minimum field-cooling current for stable levitation, the operating current of electromagnet at initial levitation, and maximum stable-levitation height were measured as a function of the load on the top surface of the bulk. It was observed that the minimum trapped field for stable levitation increased with the load. Maximum permissible displacement in the radial direction was also investigated experimentally as a function of the load and levitation height. The maximum permissible displacement decreases with levitation height and stable-levitation range decreases with weight of load. Numerical analysis based on the three-dimensional finite element method was performed to investigate electromagnetic behaviors within bulk, especially stability at initial levitation. The stability depends on the ratio of operating current at initial levitation to field-cooling current.

Original languageEnglish
Pages (from-to)2138-2141
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 II
Publication statusPublished - 2003 Jun
Event2002 Applied Superconductivity Conference - Houston, TX, United States
Duration: 2002 Aug 42002 Aug 9


  • FEM
  • Lift-to-weight ratio
  • Magnetic levitation
  • YBCO bulk


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